EUTECH INSTRUMENTS CYBERCOMM 5000 FOR CYBERSCAN 5000 Manual de instrucciones descargar pdf (Pagina 142)

Instruction Manual CyberScan PC5500/ 5000

137

12.5 Analate addition

The analate addition method is useful when your sample is at an

elevated temperature and you want to negate the effect that

temperature will have on the concentration calculation. This method

is also useful if you have only a small amount of sample available.

The analate addition method differs only slightly from the known

addition method. The difference being the solution that you are taking

your initial mV reading in is actually the standard before and after the

sample is added is used to calculate the concentration of the ion of

interest, with the analate addition method, both the sample and the

standard solution contain the ionic species of interest. See ISE theory

page 160.

To take a measurement

1. Immerse the ion selective electrode in a known volume of the

sample solution.

2. Stir the sample.

3. Touch AA to take the first mV reading of sample. Wait for the

reading to stabilize (STABLE will appear).

Touch AA to accept the current reading.

4. Add a known volume of standard solution to the sample.

5. Touch AA to take the second mV reading of sample. Wait for the

reading to stabilize (STABLE will appear).

Touch AA to accept the current reading.

6. Use the keypad to enter the sample volume.

7. Touch enter to accept the value.

8. Use the keypad to enter the standard volume.

9. Touch enter to accept the value.

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EUTECH INSTRUMENTS CYBERCOMM 5000 FOR CYBERSCAN 5000 Manual de instrucciones Pagina 142